A value expression that combines two other value expressions
    by joining the second to the end of the first. Concatenated
    expressions uses the concatenate operator (|). You can combine
    value expressions of any kind, including numeric expressions,
    string expressions, and literals.

    You can use concatenated expressions to simulate group fields and
    edit strings.

    Format

  (B)0concat-expr =

    qqq> value-expr qqq>  |  qqq> value-expr qqq>